Simmerimme

Hello! This is my first post on this website and I am happy to recieve all the help I can get. So to start, I have lost the keys to my skoda felicia pickup 1.6 and I need to get new ones. I went to the dealer and they said that my key code was lost and new keys couldnt be made. This made me think of other solutions. I went to the scrapyard to acquire a new ignition lock and key to replace my old one. Note that I took the black box I think is the immobilizer. Fast forward to when I replaced both ignition lock and the immobilizer. I started it but it dies after a second. Gave them the key to program to see if that would help, bit still the same. I used an OBD2 scanner to see if the faultcodes would help me and it gave me these two 00546 17978 Tried to erase the but they just kept coming back. Any idea on how I fix it? or if I can completely disable the immobilizer system.